/*
 * Copyright 2016-2017 Leon Chen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.moilioncircle.redis.replicator.cmd;

import java.util.function.Predicate;

import com.moilioncircle.redis.replicator.Replicator;
import com.moilioncircle.redis.replicator.event.Event;
import com.moilioncircle.redis.replicator.event.EventListener;

/**
 * @author Leon Chen
 * @since 3.6.0
 */
public class TimestampEventListener implements EventListener {
    
    private boolean guard;
    private final EventListener listener;
    private final Predicate<Long> condition;
    
    public TimestampEventListener(Predicate<Long> condition, EventListener listener) {
        this.condition = condition;
        this.listener = listener;
    }
    
    @Override
    public void onEvent(Replicator replicator, Event event) {
        if (event instanceof TimestampEvent) {
            TimestampEvent te = (TimestampEvent) event;
            guard = condition.test(te.getTimestamp());
        } else {
            if (guard) listener.onEvent(replicator, event);
        }
    }
}
